@inproceedings{inproceedings074f2a01,
title   = {Graded piezocomposite for the construction of air-coupled ultrasound transducer},
author = {Costa, David Julio da and Elvira, L and Buiochi, Flávio},
year = {2014},
doi = {10.1109/ULTSYM.2014.0515},
publisher = {Ieee},
booktitle   = {IEEE International Ultrasonics Symposium}
}